How do i successfully sell pop music i've written & recorded on the internet?

I've heard about bands and singers successfully marketing themselves and having hit albums by building up a following on the internet. Where do I start? I know there are websites who will charge me a fee to market my music but how do I know whether they're a scam or not. Thanks in anticipation.

Create a myspace profile. Market on your space.

I attached an example of a band in my home state.